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EP 3 814 723 A1

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(43) Date of publication: 05.05.2021 Bulletin 2021/18 (21) Application number: 18924580.6 (22) Date of filing: 27.06.2018

(51) International Patent Classification (IPC):  G01F 1/56(2006.01) G01F 15/06(2006.01) G01D 21/02(2006.01) G01F 15/02(2006.01) (86) International application number: PCT/US2018/039647 (87) International publication number: WO 2020/005217 (02.01.2020 Gazette 2020/01)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (71) Applicants: Services Pétroliers Schlumberger 75007 Paris (FR) FR  Schlumberger Technology B.V. 2514 JG The Hague (NL) AL AT BE BG CH CY CZ DE DK EE ES FI GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(72) Inventor: XIE, Cheng-Gang Singapore 098584 (SG) (74) Representative: Schlumberger Intellectual Property Department  Parkstraat 83 2514 JG Den Haag 2514 JG Den Haag (NL)